---
title: Envoy AI Gateway v0.4.x Release Series
description: Major release introducing Model Context Protocol (MCP) Gateway, OpenAI Image Generation, first-party Anthropic support, guided output decoding for GCP Vertex AI/Gemini, cross-namespace references, enhanced authentication, standalone mode improvements, and comprehensive observability improvements
toc_min_heading_level: 2
toc_max_heading_level: 4
---

import Link from '@docusaurus/Link';
import {
  ReleaseSeriesLayout,
  ReleaseHeader,
  FeatureSectionCard,
  PatchRelease,
  ItemList,
  Dependencies
} from '../../components/ReleaseNotes';
import releaseData from '../../data/releases/v0.4.json';
import React from 'react';

export const { series, releases, navigation } = releaseData;
export const mainRelease = releases[0]; // v0.4.0
export const patchReleases = releases.slice(1).reverse(); // Future patch releases (newest first)

<ReleaseSeriesLayout
  title={series.title}
  subtitle={series.subtitle}
  seriesVersion={series.version}
  badgeText={series.badge}
  badgeType={series.badgeType}
  previousSeries={navigation.previous}
>

<ReleaseHeader
  version={mainRelease.version}
  date={mainRelease.date}
  type={mainRelease.type}
  tags={mainRelease.tags}
>

{mainRelease.overview}

</ReleaseHeader>

## ✨ New Features

{mainRelease.features.map((featureSection, index) => (
  <FeatureSectionCard key={index} section={featureSection} />
))}

## 🔗 API Updates

{mainRelease.apiChanges.length > 0 && (
  <ItemList items={mainRelease.apiChanges} />
)}

## 📦 Dependencies Versions

<Dependencies dependencies={mainRelease.dependencies} />

## 🔮 What's Next (beyond v0.4)

We're already working on exciting features for future releases:

- **Advanced MCP features** - Further enhancements to the MCP protocol support
- **Additional LLM provider integrations** - Expanding the ecosystem of supported LLM providers
- **Enhanced Performance** - Improving the runtime performance of the gateway

</ReleaseSeriesLayout>
